Is it safe to use aluminum foil in microwave ovens?

Using aluminum foil in microwave ovens is generally not recommended due to safety concerns. Aluminum foil can cause sparks and potentially start a fire when exposed to the microwave's electromagnetic radiation. It can also reflect microwaves, damaging the oven's interior and reducing cooking efficiency. Instead, use microwave-safe containers or cover food with microwave-safe plastic wrap to prevent splatters and ensure even heating.